[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661

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wfurt merged 3 commits into

release/9.0-stagingfrom

backport/pr-123485-to-release/9.0-staging

Mar 13, 2026

Azure Pipelines / runtime (Build Libraries Test Run release coreclr windows x64 Debug) succeeded Mar 12, 2026 in 34m 19s

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